Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Oct. 01, 2016	Jul. 01, 2017	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 36,200		$ 7,900
Accumulated amortization, intangible assets	94,600				$ 94,600		$ 70,700
Accumulated impairment, intangible assets	44,100				44,100		$ 7,900
Amortization of acquired intangible assets	8,654		8,446		26,219	$ 25,851
Research and development
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	128		186		442	559
Amortization of acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 8,526		$ 8,260		$ 25,777	$ 25,292
Patents
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of intangible assets				$ 18,000
Decrease of intangible assets, net of amortization		$ 3,500
Disposed of by Sale | Hyderabad
Finite-Lived Intangible Assets [Line Items]
Ownership percentage	100.00%				100.00%